Wheel-tire grip.



G. A. LYON.

WHEEL TIRE GRIP.

APPLICATION FILED MAY I2. 19H.

Patented May 11, 1915.

I I, l I I l H I l I I l 1' "-6 E T 7 .3 2 1 l INVENTOR GEORGE ALBERTLYON BY HIS ATTORNEY GEORGE ALBERT LYON, F PHILADELPHIA, PENNSYLVANIA.

WHEEL-TIRE GRIP.

Specification of Letters Patent.

Patented m 11, 1915.

Original application filed October 29, 1909, Serial No. 525,283. Dividedand this application filed May 12,

ToaZZ whom it may concern I a citizen of the United States, residing inPhiladelphia, Pennsylvania, have invented certain Improvements inW'heeLTire Grips, (the same being a division of my application. SerialNo. 525,283, filed October 29, 1909,) of which the following is aspecification.

My invention consists of certain modifications of or improvements in thenon-skidding attachment for wheel tires constituting the subject of myapplication, Serial No. 499,919, filed June 3, 1909, the object of mypresent invention being to so construct the tread members of theattachment as to increase their grip both upon the tire and upon theroadway when they are passing between said tire and roadway, and toprevent them from imparting such lift of the tire, under the lattercircumstances, as to cause the wheel to jar the vehicle to which it isattached. These objects I attain in the manner hereinafter set forth,reference being had to the accompanying drawing, in which Figure 1 is aside elevation of a wheel with my improved tire grip applied thereto,and Fig. 2 is a view of part of the tire as it appears when resting uponthe roadway, showing the relation of the tread member of the grip to thetire and roadway under these circumstances.

In Fig. 1 of the drawing, 1 represents the elastic tire of the wheel,usually of the non-pneumatic type, 2 the metal rim, and 3 the woodenfelly, all of which may be constructed in accordance with any of themethods now used.

The non-skidding attachment shown in the drawing consists of threesections, each comprising two tread members 4, opposite side members 5,and a member 6 connecting the two side members on one side of thesection, the latter being preferably formed in one piece, and the sidemembers of each sectionon the opposite side of the wheel being connectedeither by pivoted links 7 or by a chain 9, which can be, taken up so asto tighten the attachment upon the wheel.

Serial No. 626,756.

My present invention does not relate so much to the construction of thesections of the attachment as to the construction of the tread membersof said attachment, each of said tread members being cupped or dishedwith the hollow portion on the exterior of the wheel so that whensubjected to pressure between the tire and the roadway. as shown forinstance in Fig. 2, the

inner surface of the tread member will indent the tire to the greatestextent at the middle of the tread and to the least extent at the edgesof the latter, while the grip upon the roadway will be reversed, theindentation being greatest at the edges of the tread member and least at"the center of the same. A tread member of this character not onlyinsures a firm grip upon the roadway but also causes such indentation ofthe tire as will tend to prevent the latter such that it will notreadily indent the roadway and the tire to such an extent as to permitcontact between the peripheral surface of the tire and the roadway.

I claim:

1. A tire grip having tread members crossing the tire from side to sideand each presenting both on its inner and outer faces reversely angledfore and aft portions, whereby it presents upstanding front and rearedges to the roadway, and a depressed central portion which indents thetire.

2. A tire grip having tread members crossing the tire from side to side,said tread members presenting a concavo-convex cross section with theconcave side to the roadway and the convex side to the tire.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

GEORGE ALBERT LYON.

Witnesses:

KATE A. BEADLE, HAMILTON D. TURNER.

